670556001557 has 16 divisors (see below), whose sum is σ = 734048486640. Its totient is φ = 608767142400.

The previous prime is 670556001551. The next prime is 670556001569. The reversal of 670556001557 is 755100655076.

It can be written as a sum of positive squares in 8 ways, for example, as 3272869681 + 667283131876 = 57209^2 + 816874^2 .

It is a cyclic number.

It is not a de Polignac number, because 670556001557 - 2²⁸ = 670287566101 is a prime.

It is a super-2 number, since 2×670556001557² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (670556001551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9233207 + ... + 9305547.

It is an arithmetic number, because the mean of its divisors is an integer number (45878030415).

Almost surely, 2^670556001557 is an apocalyptic number.

It is an amenable number.

670556001557 is a deficient number, since it is larger than the sum of its proper divisors (63492485083).

670556001557 is a wasteful number, since it uses less digits than its factorization.

670556001557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84104.

The product of its (nonzero) digits is 1102500, while the sum is 47.

The spelling of 670556001557 in words is "six hundred seventy billion, five hundred fifty-six million, one thousand, five hundred fifty-seven".