668040037 has 32 divisors (see below), whose sum is σ = 822804480. Its totient is φ = 530038080.

The previous prime is 668040031. The next prime is 668040047. The reversal of 668040037 is 730040866.

It is a cyclic number.

It is not a de Polignac number, because 668040037 - 2¹⁵ = 668007269 is a prime.

It is a super-2 number, since 2×668040037² = 892554982069922738, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 668039984 and 668040011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668040031) 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, 673612 + ... + 674602.

It is an arithmetic number, because the mean of its divisors is an integer number (25712640).

Almost surely, 2^668040037 is an apocalyptic number.

It is an amenable number.

668040037 is a deficient number, since it is larger than the sum of its proper divisors (154764443).

668040037 is a wasteful number, since it uses less digits than its factorization.

668040037 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1153.

The product of its (nonzero) digits is 24192, while the sum is 34.

The square root of 668040037 is about 25846.4704940539. The cubic root of 668040037 is about 874.1799280290.

The spelling of 668040037 in words is "six hundred sixty-eight million, forty thousand, thirty-seven".