161310777651 has 24 divisors (see below), whose sum is σ = 251250002640. Its totient is φ = 99395596800.

The previous prime is 161310777631. The next prime is 161310777653. The reversal of 161310777651 is 156777013161.

It is not a de Polignac number, because 161310777651 - 2¹⁵ = 161310744883 is a prime.

It is a super-2 number, since 2×161310777651² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 161310777597 and 161310777606.

It is not an unprimeable number, because it can be changed into a prime (161310777653) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11497110 + ... + 11511131.

It is an arithmetic number, because the mean of its divisors is an integer number (10468750110).

Almost surely, 2^161310777651 is an apocalyptic number.

161310777651 is a deficient number, since it is larger than the sum of its proper divisors (89939224989).

161310777651 is a wasteful number, since it uses less digits than its factorization.

161310777651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23008307 (or 23008304 counting only the distinct ones).

The product of its (nonzero) digits is 185220, while the sum is 45.

It can be divided in two parts, 161310 and 777651, that added together give a square (938961 = 969²).

The spelling of 161310777651 in words is "one hundred sixty-one billion, three hundred ten million, seven hundred seventy-seven thousand, six hundred fifty-one".