67540374981 has 6 divisors (see below), whose sum is σ = 97558319430. Its totient is φ = 45026916648.

The previous prime is 67540374973. The next prime is 67540374997. The reversal of 67540374981 is 18947304576.

67540374981 is a `hidden beast` number, since 6 + 7 + 540 + 3 + 7 + 4 + 98 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 40979524356 + 26560850625 = 202434^2 + 162975^2 .

It is not a de Polignac number, because 67540374981 - 2³ = 67540374973 is a prime.

It is a super-2 number, since 2×67540374981² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67540374581) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3752243046 + ... + 3752243063.

It is an arithmetic number, because the mean of its divisors is an integer number (16259719905).

Almost surely, 2^67540374981 is an apocalyptic number.

It is an amenable number.

67540374981 is a deficient number, since it is larger than the sum of its proper divisors (30017944449).

67540374981 is a wasteful number, since it uses less digits than its factorization.

67540374981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7504486115 (or 7504486112 counting only the distinct ones).

The product of its (nonzero) digits is 5080320, while the sum is 54.

The spelling of 67540374981 in words is "sixty-seven billion, five hundred forty million, three hundred seventy-four thousand, nine hundred eighty-one".