161651505115101 has 8 divisors (see below), whose sum is σ = 215536600931904. Its totient is φ = 107767039687520.

The previous prime is 161651505115097. The next prime is 161651505115109. The reversal of 161651505115101 is 101511505156161.

161651505115101 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 161651505115101 - 2² = 161651505115097 is a prime.

It is a super-2 number, since 2×161651505115101² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 161651505115101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161651505115109) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 156998640 + ... + 158024921.

It is an arithmetic number, because the mean of its divisors is an integer number (26942075116488).

Almost surely, 2^{161651505115101} is an apocalyptic number.

It is an amenable number.

161651505115101 is a deficient number, since it is larger than the sum of its proper divisors (53885095816803).

161651505115101 is a wasteful number, since it uses less digits than its factorization.

161651505115101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315194611.

The product of its (nonzero) digits is 22500, while the sum is 39.

The spelling of 161651505115101 in words is "one hundred sixty-one trillion, six hundred fifty-one billion, five hundred five million, one hundred fifteen thousand, one hundred one".