161211501425251 has 8 divisors (see below), whose sum is σ = 170696145936240. Its totient is φ = 151727036360448.

The previous prime is 161211501425141. The next prime is 161211501425257. The reversal of 161211501425251 is 152524105112161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 161211501425251 - 2²⁷ = 161211367207523 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 161211501425251.

It is not an unprimeable number, because it can be changed into a prime (161211501425257) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43009741 + ... + 46607518.

It is an arithmetic number, because the mean of its divisors is an integer number (21337018242030).

Almost surely, 2^{161211501425251} is an apocalyptic number.

161211501425251 is a deficient number, since it is larger than the sum of its proper divisors (9484644510989).

161211501425251 is a wasteful number, since it uses less digits than its factorization.

161211501425251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89723093.

The product of its (nonzero) digits is 24000, while the sum is 37.

The spelling of 161211501425251 in words is "one hundred sixty-one trillion, two hundred eleven billion, five hundred one million, four hundred twenty-five thousand, two hundred fifty-one".