66261457632 has 48 divisors (see below), whose sum is σ = 174452542992. Its totient is φ = 22021601280.

The previous prime is 66261457601. The next prime is 66261457637. The reversal of 66261457632 is 23675416266.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66261457637) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 991719 + ... + 1056422.

It is an arithmetic number, because the mean of its divisors is an integer number (3634427979).

Almost surely, 2^66261457632 is an apocalyptic number.

It is an amenable number.

66261457632 is an abundant number, since it is smaller than the sum of its proper divisors (108191085360).

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

66261457632 is a wasteful number, since it uses less digits than its factorization.

66261457632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2048491 (or 2048483 counting only the distinct ones).

The product of its digits is 2177280, while the sum is 48.

The spelling of 66261457632 in words is "sixty-six billion, two hundred sixty-one million, four hundred fifty-seven thousand, six hundred thirty-two".