73405037621 has 4 divisors (see below), whose sum is σ = 73470403872. Its totient is φ = 73339671372.

The previous prime is 73405037549. The next prime is 73405037677. The reversal of 73405037621 is 12673050437.

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 a de Polignac number, because none of the positive numbers 2^k-73405037621 is a prime.

It is a super-3 number, since 3×73405037621³ (a number of 34 digits) contains 333 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 (73405037021) 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, 32681441 + ... + 32683686.

It is an arithmetic number, because the mean of its divisors is an integer number (18367600968).

Almost surely, 2^73405037621 is an apocalyptic number.

It is an amenable number.

73405037621 is a deficient number, since it is larger than the sum of its proper divisors (65366251).

73405037621 is a wasteful number, since it uses less digits than its factorization.

73405037621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65366250.

The product of its (nonzero) digits is 105840, while the sum is 38.

The spelling of 73405037621 in words is "seventy-three billion, four hundred five million, thirty-seven thousand, six hundred twenty-one".