690625813987 has 4 divisors (see below), whose sum is σ = 692616090456. Its totient is φ = 688635537520.

The previous prime is 690625813981. The next prime is 690625813991. The reversal of 690625813987 is 789318526096.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 690625813987 - 2⁷ = 690625813859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (690625813981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 995137714 + ... + 995138407.

It is an arithmetic number, because the mean of its divisors is an integer number (173154022614).

Almost surely, 2^690625813987 is an apocalyptic number.

690625813987 is a deficient number, since it is larger than the sum of its proper divisors (1990276469).

690625813987 is a wasteful number, since it uses less digits than its factorization.

690625813987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1990276468.

The product of its (nonzero) digits is 39191040, while the sum is 64.

The spelling of 690625813987 in words is "six hundred ninety billion, six hundred twenty-five million, eight hundred thirteen thousand, nine hundred eighty-seven".