612501952181 has 4 divisors (see below), whose sum is σ = 700002231072. Its totient is φ = 525001673292.

The previous prime is 612501952133. The next prime is 612501952187. The reversal of 612501952181 is 181259105216.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 612501952181 - 2¹⁰ = 612501951157 is a prime.

It is a super-2 number, since 2×612501952181² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (612501952187) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43750139435 + ... + 43750139448.

It is an arithmetic number, because the mean of its divisors is an integer number (175000557768).

Almost surely, 2^612501952181 is an apocalyptic number.

It is an amenable number.

612501952181 is a deficient number, since it is larger than the sum of its proper divisors (87500278891).

612501952181 is an equidigital number, since it uses as much as digits as its factorization.

612501952181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87500278890.

The product of its (nonzero) digits is 43200, while the sum is 41.

The spelling of 612501952181 in words is "six hundred twelve billion, five hundred one million, nine hundred fifty-two thousand, one hundred eighty-one".