66889351560 has 64 divisors (see below), whose sum is σ = 201899206080. Its totient is φ = 17727724800.

The previous prime is 66889351537. The next prime is 66889351583. The reversal of 66889351560 is 6515398866.

It is an interprime number because it is at equal distance from previous prime (66889351537) and next prime (66889351583).

It is a self number, because there is not a number n which added to its sum of digits gives 66889351560.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1690291 + ... + 1729410.

It is an arithmetic number, because the mean of its divisors is an integer number (3154675095).

Almost surely, 2^66889351560 is an apocalyptic number.

66889351560 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66889351560 is an abundant number, since it is smaller than the sum of its proper divisors (135009854520).

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

66889351560 is a wasteful number, since it uses less digits than its factorization.

66889351560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3419878 (or 3419874 counting only the distinct ones).

The product of its (nonzero) digits is 9331200, while the sum is 57.

The spelling of 66889351560 in words is "sixty-six billion, eight hundred eighty-nine million, three hundred fifty-one thousand, five hundred sixty".