69991231680 has 392 divisors, whose sum is σ = 251318981232. Its totient is φ = 18557392896.

The previous prime is 69991231669. The next prime is 69991231691. The reversal of 69991231680 is 8613219996.

It is an interprime number because it is at equal distance from previous prime (69991231669) and next prime (69991231691).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 45955399 + ... + 45956921.

Almost surely, 2^69991231680 is an apocalyptic number.

69991231680 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 69991231680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (125659490616).

69991231680 is an abundant number, since it is smaller than the sum of its proper divisors (181327749552).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

69991231680 is a wasteful number, since it uses less digits than its factorization.

69991231680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1755 (or 1730 counting only the distinct ones).

The product of its (nonzero) digits is 1259712, while the sum is 54.

The spelling of 69991231680 in words is "sixty-nine billion, nine hundred ninety-one million, two hundred thirty-one thousand, six hundred eighty".