69990406997 has 6 divisors (see below), whose sum is σ = 81417412278. Its totient is φ = 59991777384.

The previous prime is 69990406943. The next prime is 69990406999. The reversal of 69990406997 is 79960409996.

It can be written as a sum of positive squares in only one way, i.e., 56784030436 + 13206376561 = 238294^2 + 114919^2 .

It is not a de Polignac number, because 69990406997 - 2¹⁶ = 69990341461 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 (69990406999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 714187778 + ... + 714187875.

It is an arithmetic number, because the mean of its divisors is an integer number (13569568713).

Almost surely, 2^69990406997 is an apocalyptic number.

It is an amenable number.

69990406997 is a deficient number, since it is larger than the sum of its proper divisors (11427005281).

69990406997 is a wasteful number, since it uses less digits than its factorization.

69990406997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1428375667 (or 1428375660 counting only the distinct ones).

The product of its (nonzero) digits is 59521392, while the sum is 68.

The spelling of 69990406997 in words is "sixty-nine billion, nine hundred ninety million, four hundred six thousand, nine hundred ninety-seven".