161266694056 has 64 divisors (see below), whose sum is σ = 331560028800. Its totient is φ = 73080748800.

The previous prime is 161266694047. The next prime is 161266694081. The reversal of 161266694056 is 650496662161.

It is a super-2 number, since 2×161266694056² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (52).

It is a junction number, because it is equal to n+sod(n) for n = 161266693994 and 161266694012.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3600165 + ... + 3644683.

It is an arithmetic number, because the mean of its divisors is an integer number (5180625450).

Almost surely, 2^161266694056 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161266694056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (165780014400).

161266694056 is an abundant number, since it is smaller than the sum of its proper divisors (170293334744).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161266694056 is a wasteful number, since it uses less digits than its factorization.

161266694056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45170 (or 45166 counting only the distinct ones).

The product of its (nonzero) digits is 2799360, while the sum is 52.

The spelling of 161266694056 in words is "one hundred sixty-one billion, two hundred sixty-six million, six hundred ninety-four thousand, fifty-six".