161651201145 has 192 divisors, whose sum is σ = 337547761920. Its totient is φ = 65455423488.

The previous prime is 161651201119. The next prime is 161651201147. The reversal of 161651201145 is 541102156161.

It is not a de Polignac number, because 161651201145 - 2¹² = 161651197049 is a prime.

It is a super-2 number, since 2×161651201145² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161651201147) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 37270417 + ... + 37274753.

It is an arithmetic number, because the mean of its divisors is an integer number (1758061260).

Almost surely, 2^161651201145 is an apocalyptic number.

161651201145 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

161651201145 is an abundant number, since it is smaller than the sum of its proper divisors (175896560775).

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

161651201145 is a wasteful number, since it uses less digits than its factorization.

161651201145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4552 (or 4545 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 33.

The spelling of 161651201145 in words is "one hundred sixty-one billion, six hundred fifty-one million, two hundred one thousand, one hundred forty-five".