66101001505556 has 48 divisors (see below), whose sum is σ = 120737025722880. Its totient is φ = 31635200513280.

The previous prime is 66101001505547. The next prime is 66101001505559. The reversal of 66101001505556 is 65550510010166.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66101001505559) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 475617605 + ... + 475756563.

It is an arithmetic number, because the mean of its divisors is an integer number (2515354702560).

Almost surely, 2^{66101001505556} is an apocalyptic number.

It is an amenable number.

66101001505556 is a deficient number, since it is larger than the sum of its proper divisors (54636024217324).

66101001505556 is a wasteful number, since it uses less digits than its factorization.

66101001505556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193784 (or 193782 counting only the distinct ones).

The product of its (nonzero) digits is 135000, while the sum is 41.

The spelling of 66101001505556 in words is "sixty-six trillion, one hundred one billion, one million, five hundred five thousand, five hundred fifty-six".