166515600606061 has 6 divisors (see below), whose sum is σ = 193701821113230. Its totient is φ = 142727657662296.

The previous prime is 166515600606049. The next prime is 166515600606067. The reversal of 166515600606061 is 160606006515661.

It can be written as a sum of positive squares in only one way, i.e., 126074586150436 + 40441014455625 = 11228294^2 + 6359325^2 .

It is not a de Polignac number, because 166515600606061 - 2²³ = 166515592217453 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49), and also a Moran number because the ratio is a prime number: 3398277563389 = 166515600606061 / (1 + 6 + 6 + 5 + 1 + 5 + 6 + 0 + 0 + 6 + 0 + 6 + 0 + 6 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 166515600605996 and 166515600606014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166515600606067) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1699138781646 + ... + 1699138781743.

It is an arithmetic number, because the mean of its divisors is an integer number (32283636852205).

Almost surely, 2^{166515600606061} is an apocalyptic number.

It is an amenable number.

166515600606061 is a deficient number, since it is larger than the sum of its proper divisors (27186220507169).

166515600606061 is an equidigital number, since it uses as much as digits as its factorization.

166515600606061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3398277563403 (or 3398277563396 counting only the distinct ones).

The product of its (nonzero) digits is 1166400, while the sum is 49.

The spelling of 166515600606061 in words is "one hundred sixty-six trillion, five hundred fifteen billion, six hundred million, six hundred six thousand, sixty-one".