667665070426620 has 144 divisors (see below), whose sum is σ = 2314578610868160. Its totient is φ = 152608739171328.

The previous prime is 667665070426579. The next prime is 667665070426631. The reversal of 667665070426620 is 26624070566766.

667665070426620 is a `hidden beast` number, since 6 + 6 + 7 + 6 + 6 + 507 + 0 + 42 + 66 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 873464514 + ... + 874228566.

Almost surely, 2^{667665070426620} is an apocalyptic number.

667665070426620 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

667665070426620 is an abundant number, since it is smaller than the sum of its proper divisors (1646913540441540).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

667665070426620 is a wasteful number, since it uses less digits than its factorization.

667665070426620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1457604 (or 1457599 counting only the distinct ones).

The product of its (nonzero) digits is 182891520, while the sum is 63.

The spelling of 667665070426620 in words is "six hundred sixty-seven trillion, six hundred sixty-five billion, seventy million, four hundred twenty-six thousand, six hundred twenty".