705081557421 has 12 divisors (see below), whose sum is σ = 1019088886972. Its totient is φ = 469760026176.

The previous prime is 705081557417. The next prime is 705081557459. The reversal of 705081557421 is 124755180507.

705081557421 is a `hidden beast` number, since 7 + 0 + 50 + 8 + 1 + 5 + 574 + 21 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 427206032100 + 277875525321 = 653610^2 + 527139^2 .

It is not a de Polignac number, because 705081557421 - 2² = 705081557417 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (705081557491) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24513616 + ... + 24542361.

Almost surely, 2^705081557421 is an apocalyptic number.

It is an amenable number.

705081557421 is a deficient number, since it is larger than the sum of its proper divisors (314007329551).

705081557421 is a wasteful number, since it uses less digits than its factorization.

705081557421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49057580 (or 49057577 counting only the distinct ones).

The product of its (nonzero) digits is 392000, while the sum is 45.

The spelling of 705081557421 in words is "seven hundred five billion, eighty-one million, five hundred fifty-seven thousand, four hundred twenty-one".