69661681 has 8 divisors (see below), whose sum is σ = 72610304. Its totient is φ = 66756960.

The previous prime is 69661673. The next prime is 69661693. The reversal of 69661681 is 18616696.

It is a happy number.

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 69661681 - 2³ = 69661673 is a prime.

It is a super-2 number, since 2×69661681² = 9705499599491522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (69661481) 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, 7716 + ... + 14101.

It is an arithmetic number, because the mean of its divisors is an integer number (9076288).

Almost surely, 2^69661681 is an apocalyptic number.

It is an amenable number.

69661681 is a deficient number, since it is larger than the sum of its proper divisors (2948623).

69661681 is a wasteful number, since it uses less digits than its factorization.

69661681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21951.

The product of its digits is 93312, while the sum is 43.

The square root of 69661681 is about 8346.3573491674. The cubic root of 69661681 is about 411.4635007123.

The spelling of 69661681 in words is "sixty-nine million, six hundred sixty-one thousand, six hundred eighty-one".