816638170431 has 8 divisors (see below), whose sum is σ = 1089345160960. Its totient is φ = 544178313432.

The previous prime is 816638170421. The next prime is 816638170471. The reversal of 816638170431 is 134071836618.

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

It is not a de Polignac number, because 816638170431 - 2¹³ = 816638162239 is a prime.

It is a super-2 number, since 2×816638170431² (a number of 25 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 (816638170421) 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, 61775671 + ... + 61788888.

It is an arithmetic number, because the mean of its divisors is an integer number (136168145120).

Almost surely, 2^816638170431 is an apocalyptic number.

816638170431 is a deficient number, since it is larger than the sum of its proper divisors (272706990529).

816638170431 is a wasteful number, since it uses less digits than its factorization.

816638170431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123566765.

The product of its (nonzero) digits is 580608, while the sum is 48.

The spelling of 816638170431 in words is "eight hundred sixteen billion, six hundred thirty-eight million, one hundred seventy thousand, four hundred thirty-one".