66400562553 has 48 divisors (see below), whose sum is σ = 96661103616. Its totient is φ = 40525168320.

The previous prime is 66400562537. The next prime is 66400562587. The reversal of 66400562553 is 35526500466.

It is not a de Polignac number, because 66400562553 - 2⁴ = 66400562537 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66400562533) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 68666076 + ... + 68667042.

It is an arithmetic number, because the mean of its divisors is an integer number (2013772992).

Almost surely, 2^66400562553 is an apocalyptic number.

It is an amenable number.

66400562553 is a deficient number, since it is larger than the sum of its proper divisors (30260541063).

66400562553 is a wasteful number, since it uses less digits than its factorization.

66400562553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1974 (or 1961 counting only the distinct ones).

The product of its (nonzero) digits is 648000, while the sum is 42.

The spelling of 66400562553 in words is "sixty-six billion, four hundred million, five hundred sixty-two thousand, five hundred fifty-three".