66261142737764 has 96 divisors (see below), whose sum is σ = 140906824805376. Its totient is φ = 26945899960320.

The previous prime is 66261142737749. The next prime is 66261142737791. The reversal of 66261142737764 is 46773724116266.

It is a junction number, because it is equal to n+sod(n) for n = 66261142737697 and 66261142737706.

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, 33714167 + ... + 35625374.

It is an arithmetic number, because the mean of its divisors is an integer number (1467779425056).

Almost surely, 2^{66261142737764} is an apocalyptic number.

It is an amenable number.

66261142737764 is an abundant number, since it is smaller than the sum of its proper divisors (74645682067612).

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

66261142737764 is a wasteful number, since it uses less digits than its factorization.

66261142737764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69339645 (or 69339643 counting only the distinct ones).

The product of its digits is 85349376, while the sum is 62.

The spelling of 66261142737764 in words is "sixty-six trillion, two hundred sixty-one billion, one hundred forty-two million, seven hundred thirty-seven thousand, seven hundred sixty-four".