67641562576621 has 4 divisors (see below), whose sum is σ = 73790795538144. Its totient is φ = 61492329615100.

The previous prime is 67641562576603. The next prime is 67641562576661. The reversal of 67641562576621 is 12667526514676.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 67641562576621 - 2⁷ = 67641562576493 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 (67641562576661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3074616480745 + ... + 3074616480766.

It is an arithmetic number, because the mean of its divisors is an integer number (18447698884536).

Almost surely, 2^{67641562576621} is an apocalyptic number.

It is an amenable number.

67641562576621 is a deficient number, since it is larger than the sum of its proper divisors (6149232961523).

67641562576621 is a wasteful number, since it uses less digits than its factorization.

67641562576621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6149232961522.

The product of its digits is 152409600, while the sum is 64.

The spelling of 67641562576621 in words is "sixty-seven trillion, six hundred forty-one billion, five hundred sixty-two million, five hundred seventy-six thousand, six hundred twenty-one".