161572068786 has 32 divisors (see below), whose sum is σ = 343454192640. Its totient is φ = 50527388304.

The previous prime is 161572068781. The next prime is 161572068787. The reversal of 161572068786 is 687860275161.

It is a happy number.

It is a super-2 number, since 2×161572068786² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is not an unprimeable number, because it can be changed into a prime (161572068781) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6868350 + ... + 6891833.

It is an arithmetic number, because the mean of its divisors is an integer number (10732943520).

Almost surely, 2^161572068786 is an apocalyptic number.

161572068786 is an abundant number, since it is smaller than the sum of its proper divisors (181882123854).

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

161572068786 is a wasteful number, since it uses less digits than its factorization.

161572068786 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13760310.

The product of its (nonzero) digits is 6773760, while the sum is 57.

The spelling of 161572068786 in words is "one hundred sixty-one billion, five hundred seventy-two million, sixty-eight thousand, seven hundred eighty-six".