85172591002 has 4 divisors (see below), whose sum is σ = 127758886506. Its totient is φ = 42586295500.

The previous prime is 85172590999. The next prime is 85172591011. The reversal of 85172591002 is 20019527158.

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

It can be written as a sum of positive squares in only one way, i.e., 83862947281 + 1309643721 = 289591^2 + 36189^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21293147749 + ... + 21293147752.

Almost surely, 2^85172591002 is an apocalyptic number.

85172591002 is a deficient number, since it is larger than the sum of its proper divisors (42586295504).

85172591002 is a wasteful number, since it uses less digits than its factorization.

85172591002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42586295503.

The product of its (nonzero) digits is 50400, while the sum is 40.

The spelling of 85172591002 in words is "eighty-five billion, one hundred seventy-two million, five hundred ninety-one thousand, two".