66261356 has 12 divisors (see below), whose sum is σ = 132522768. Its totient is φ = 28397712.

The previous prime is 66261347. The next prime is 66261401. The reversal of 66261356 is 65316266.

66261356 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1183211 + ... + 1183266.

It is an arithmetic number, because the mean of its divisors is an integer number (11043564).

Almost surely, 2^66261356 is an apocalyptic number.

It is an amenable number.

66261356 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

66261356 is a wasteful number, since it uses less digits than its factorization.

66261356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2366488 (or 2366486 counting only the distinct ones).

The product of its digits is 38880, while the sum is 35.

The square root of 66261356 is about 8140.1078616932. The cubic root of 66261356 is about 404.6567350017.

The spelling of 66261356 in words is "sixty-six million, two hundred sixty-one thousand, three hundred fifty-six".