67421777464631 has 16 divisors (see below), whose sum is σ = 70716158300160. Its totient is φ = 64158494357760.

The previous prime is 67421777464589. The next prime is 67421777464667. The reversal of 67421777464631 is 13646477712476.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 67421777464631 - 2⁶ = 67421777464567 is a prime.

It is a super-2 number, since 2×67421777464631² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67421777464681) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6134351 + ... + 13132928.

It is an arithmetic number, because the mean of its divisors is an integer number (4419759893760).

Almost surely, 2^{67421777464631} is an apocalyptic number.

67421777464631 is a deficient number, since it is larger than the sum of its proper divisors (3294380835529).

67421777464631 is a wasteful number, since it uses less digits than its factorization.

67421777464631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19268086.

The product of its digits is 199148544, while the sum is 65.

The spelling of 67421777464631 in words is "sixty-seven trillion, four hundred twenty-one billion, seven hundred seventy-seven million, four hundred sixty-four thousand, six hundred thirty-one".