69217926649 has 27 divisors (see below), whose sum is σ = 74598554511. Its totient is φ = 64215739440.

The previous prime is 69217926643. The next prime is 69217926667. The reversal of 69217926649 is 94662971296.

The square root of 69217926649 is 263093.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 2250838249 + 66967088400 = 47443^2 + 258780^2 .

It is not a de Polignac number, because 69217926649 - 2³ = 69217926641 is a prime.

It is a super-2 number, since 2×69217926649² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (61).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (69217926641) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 304924674 + ... + 304924900.

Almost surely, 2^69217926649 is an apocalyptic number.

69217926649 is the 263093-rd square number.

69217926649 is the 131547-th centered octagonal number.

It is an amenable number.

69217926649 is a deficient number, since it is larger than the sum of its proper divisors (5380627862).

69217926649 is an frugal number, since it uses more digits than its factorization.

69217926649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 614 (or 307 counting only the distinct ones).

The product of its digits is 17635968, while the sum is 61.

The spelling of 69217926649 in words is "sixty-nine billion, two hundred seventeen million, nine hundred twenty-six thousand, six hundred forty-nine".