161036036251 has 4 divisors (see below), whose sum is σ = 161209380600. Its totient is φ = 160862691904.

The previous prime is 161036036233. The next prime is 161036036263. The reversal of 161036036251 is 152630630161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 152630630161 = 3541 ⋅43103821.

It is a cyclic number.

It is not a de Polignac number, because 161036036251 - 2¹³ = 161036028059 is a prime.

It is a super-2 number, since 2×161036036251² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161036036351) 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, 86670781 + ... + 86672638.

It is an arithmetic number, because the mean of its divisors is an integer number (40302345150).

Almost surely, 2^161036036251 is an apocalyptic number.

161036036251 is a deficient number, since it is larger than the sum of its proper divisors (173344349).

161036036251 is an equidigital number, since it uses as much as digits as its factorization.

161036036251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173344348.

The product of its (nonzero) digits is 19440, while the sum is 34.

The spelling of 161036036251 in words is "one hundred sixty-one billion, thirty-six million, thirty-six thousand, two hundred fifty-one".