66451501643340 has 96 divisors (see below), whose sum is σ = 204577393434624. Its totient is φ = 15982608821760.

The previous prime is 66451501643311. The next prime is 66451501643369. The reversal of 66451501643340 is 4334610515466.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (66451501643311) and next prime (66451501643369).

It is a self number, because there is not a number n which added to its sum of digits gives 66451501643340.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 396310249 + ... + 396477888.

It is an arithmetic number, because the mean of its divisors is an integer number (2131014514944).

Almost surely, 2^{66451501643340} is an apocalyptic number.

66451501643340 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66451501643340 is an abundant number, since it is smaller than the sum of its proper divisors (138125891791284).

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

66451501643340 is a wasteful number, since it uses less digits than its factorization.

66451501643340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 792788287 (or 792788285 counting only the distinct ones).

The product of its (nonzero) digits is 3110400, while the sum is 48.

The spelling of 66451501643340 in words is "sixty-six trillion, four hundred fifty-one billion, five hundred one million, six hundred forty-three thousand, three hundred forty".