64511231423021 has 8 divisors (see below), whose sum is σ = 67316152507584. Its totient is φ = 61706317416480.

The previous prime is 64511231422961. The next prime is 64511231423033. The reversal of 64511231423021 is 12032413211546.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64511231423021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64511231423071) 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, 26390345 + ... + 28731041.

It is an arithmetic number, because the mean of its divisors is an integer number (8414519063448).

Almost surely, 2^{64511231423021} is an apocalyptic number.

It is an amenable number.

64511231423021 is a deficient number, since it is larger than the sum of its proper divisors (2804921084563).

64511231423021 is a wasteful number, since it uses less digits than its factorization.

64511231423021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3539011.

The product of its (nonzero) digits is 34560, while the sum is 35.

Adding to 64511231423021 its reverse (12032413211546), we get a palindrome (76543644634567).

The spelling of 64511231423021 in words is "sixty-four trillion, five hundred eleven billion, two hundred thirty-one million, four hundred twenty-three thousand, twenty-one".