69216874281 has 9 divisors (see below), whose sum is σ = 99981069591. Its totient is φ = 46144056672.

The previous prime is 69216874273. The next prime is 69216874351. The reversal of 69216874281 is 18247861296.

It is a happy number.

The square root of 69216874281 is 263091.

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., 68961386025 + 255488256 = 262605^2 + 15984^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 69216874281 - 2³ = 69216874273 is a prime.

It is a super-2 number, since 2×69216874281² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (69216874481) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 745425 + ... + 833121.

Almost surely, 2^69216874281 is an apocalyptic number.

69216874281 is the 263091-st square number.

69216874281 is the 131546-th centered octagonal number.

It is an amenable number.

69216874281 is a deficient number, since it is larger than the sum of its proper divisors (30764195310).

69216874281 is an frugal number, since it uses more digits than its factorization.

69216874281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175400 (or 87700 counting only the distinct ones).

The product of its digits is 2322432, while the sum is 54.

The spelling of 69216874281 in words is "sixty-nine billion, two hundred sixteen million, eight hundred seventy-four thousand, two hundred eighty-one".