161556051304 has 16 divisors (see below), whose sum is σ = 303761383200. Its totient is φ = 80553015792.

The previous prime is 161556051301. The next prime is 161556051317. The reversal of 161556051304 is 403150655161.

It is a super-2 number, since 2×161556051304² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161556051301) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28123182 + ... + 28128925.

It is an arithmetic number, because the mean of its divisors is an integer number (18985086450).

Almost surely, 2^161556051304 is an apocalyptic number.

It is an amenable number.

161556051304 is a deficient number, since it is larger than the sum of its proper divisors (142205331896).

161556051304 is a wasteful number, since it uses less digits than its factorization.

161556051304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56252472 (or 56252468 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 37.

The spelling of 161556051304 in words is "one hundred sixty-one billion, five hundred fifty-six million, fifty-one thousand, three hundred four".