39168691639 has 32 divisors (see below), whose sum is σ = 51792399360. Its totient is φ = 28715385600.

The previous prime is 39168691637. The next prime is 39168691643. The reversal of 39168691639 is 93619686193.

It is not a de Polignac number, because 39168691639 - 2¹ = 39168691637 is a prime.

It is a super-2 number, since 2×39168691639² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (61).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39168691633) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 73254 + ... + 289315.

It is an arithmetic number, because the mean of its divisors is an integer number (1618512480).

Almost surely, 2^39168691639 is an apocalyptic number.

39168691639 is a deficient number, since it is larger than the sum of its proper divisors (12623707721).

39168691639 is a wasteful number, since it uses less digits than its factorization.

39168691639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 362671.

The product of its digits is 11337408, while the sum is 61.

The spelling of 39168691639 in words is "thirty-nine billion, one hundred sixty-eight million, six hundred ninety-one thousand, six hundred thirty-nine".