172405816583887 has 16 divisors (see below), whose sum is σ = 173205859790880. Its totient is φ = 171607292623872.

The previous prime is 172405816583863. The next prime is 172405816583939. The reversal of 172405816583887 is 788385618504271.

It is a cyclic number.

It is not a de Polignac number, because 172405816583887 - 2²³ = 172405808195279 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 (172405816583807) 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, 1317588688 + ... + 1317719530.

It is an arithmetic number, because the mean of its divisors is an integer number (10825366236930).

Almost surely, 2^{172405816583887} is an apocalyptic number.

172405816583887 is a deficient number, since it is larger than the sum of its proper divisors (800043206993).

172405816583887 is a wasteful number, since it uses less digits than its factorization.

172405816583887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136602.

The product of its (nonzero) digits is 722534400, while the sum is 73.

The spelling of 172405816583887 in words is "one hundred seventy-two trillion, four hundred five billion, eight hundred sixteen million, five hundred eighty-three thousand, eight hundred eighty-seven".