69921511997 has 8 divisors (see below), whose sum is σ = 73101631680. Its totient is φ = 66753063520.

The previous prime is 69921511973. The next prime is 69921512027. The reversal of 69921511997 is 79911512996.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 69921511997 - 2²² = 69917317693 is a prime.

It is a super-2 number, since 2×69921511997² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (69921511927) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2905547 + ... + 2929512.

It is an arithmetic number, because the mean of its divisors is an integer number (9137703960).

Almost surely, 2^69921511997 is an apocalyptic number.

It is an amenable number.

69921511997 is a deficient number, since it is larger than the sum of its proper divisors (3180119683).

69921511997 is a wasteful number, since it uses less digits than its factorization.

69921511997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5835603.

The product of its digits is 2755620, while the sum is 59.

Subtracting 69921511997 from its reverse (79911512996), we obtain a palindrome (9990000999).

The spelling of 69921511997 in words is "sixty-nine billion, nine hundred twenty-one million, five hundred eleven thousand, nine hundred ninety-seven".