172625434991 has 4 divisors (see below), whose sum is σ = 174301410192. Its totient is φ = 170949459792.

The previous prime is 172625434979. The next prime is 172625434997. The reversal of 172625434991 is 199434526271.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 172625434991 - 2¹⁴ = 172625418607 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172625434997) 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, 837987446 + ... + 837987651.

It is an arithmetic number, because the mean of its divisors is an integer number (43575352548).

Almost surely, 2^172625434991 is an apocalyptic number.

172625434991 is a deficient number, since it is larger than the sum of its proper divisors (1675975201).

172625434991 is a wasteful number, since it uses less digits than its factorization.

172625434991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1675975200.

The product of its digits is 3265920, while the sum is 53.

The spelling of 172625434991 in words is "one hundred seventy-two billion, six hundred twenty-five million, four hundred thirty-four thousand, nine hundred ninety-one".