66605251450 has 48 divisors (see below), whose sum is σ = 130610077920. Its totient is φ = 25200400320.

The previous prime is 66605251429. The next prime is 66605251457. The reversal of 66605251450 is 5415250666.

It is not an unprimeable number, because it can be changed into a prime (66605251457) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 556332 + ... + 665368.

It is an arithmetic number, because the mean of its divisors is an integer number (2721043290).

Almost surely, 2^66605251450 is an apocalyptic number.

66605251450 is a deficient number, since it is larger than the sum of its proper divisors (64004826470).

66605251450 is a wasteful number, since it uses less digits than its factorization.

66605251450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109711 (or 109706 counting only the distinct ones).

The product of its (nonzero) digits is 216000, while the sum is 40.

The spelling of 66605251450 in words is "sixty-six billion, six hundred five million, two hundred fifty-one thousand, four hundred fifty".