696557961 has 20 divisors (see below), whose sum is σ = 1135132944. Its totient is φ = 422155800.

The previous prime is 696557951. The next prime is 696557969. The reversal of 696557961 is 169755696.

696557961 is a `hidden beast` number, since 6 + 9 + 6 + 5 + 579 + 61 = 666.

It is not a de Polignac number, because 696557961 - 2⁷ = 696557833 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 696557898 and 696557907.

It is not an unprimeable number, because it can be changed into a prime (696557969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 389995 + ... + 391776.

Almost surely, 2^696557961 is an apocalyptic number.

It is an amenable number.

696557961 is a deficient number, since it is larger than the sum of its proper divisors (438574983).

696557961 is a wasteful number, since it uses less digits than its factorization.

696557961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 781794 (or 781785 counting only the distinct ones).

The product of its digits is 3061800, while the sum is 54.

The square root of 696557961 is about 26392.3845266016. The cubic root of 696557961 is about 886.4462763873.

The spelling of 696557961 in words is "six hundred ninety-six million, five hundred fifty-seven thousand, nine hundred sixty-one".