699866420121 has 24 divisors (see below), whose sum is σ = 1139666168480. Its totient is φ = 424161464760.

The previous prime is 699866420119. The next prime is 699866420131. The reversal of 699866420121 is 121024668996.

699866420121 is a `hidden beast` number, since 6 + 9 + 98 + 6 + 6 + 420 + 121 = 666.

It is not a de Polignac number, because 699866420121 - 2¹ = 699866420119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (699866420131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 107108215 + ... + 107114748.

Almost surely, 2^699866420121 is an apocalyptic number.

It is an amenable number.

699866420121 is a deficient number, since it is larger than the sum of its proper divisors (439799748359).

699866420121 is a wasteful number, since it uses less digits than its factorization.

699866420121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214222994 (or 214222977 counting only the distinct ones).

The product of its (nonzero) digits is 2239488, while the sum is 54.

The spelling of 699866420121 in words is "six hundred ninety-nine billion, eight hundred sixty-six million, four hundred twenty thousand, one hundred twenty-one".