67765537731 has 24 divisors (see below), whose sum is σ = 95421962064. Its totient is φ = 42771395520.

The previous prime is 67765537709. The next prime is 67765537739. The reversal of 67765537731 is 13773556776.

67765537731 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 67765537731 - 2⁵ = 67765537699 is a prime.

It is a super-2 number, since 2×67765537731² (a number of 22 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (57) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is not an unprimeable number, because it can be changed into a prime (67765537739) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1709961 + ... + 1749141.

It is an arithmetic number, because the mean of its divisors is an integer number (3975915086).

Almost surely, 2^67765537731 is an apocalyptic number.

67765537731 is a deficient number, since it is larger than the sum of its proper divisors (27656424333).

67765537731 is a wasteful number, since it uses less digits than its factorization.

67765537731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40819 (or 40800 counting only the distinct ones).

The product of its digits is 19448100, while the sum is 57.

The spelling of 67765537731 in words is "sixty-seven billion, seven hundred sixty-five million, five hundred thirty-seven thousand, seven hundred thirty-one".