1231172355655 has 32 divisors (see below), whose sum is σ = 1640993395968. Its totient is φ = 879241248000.

The previous prime is 1231172355601. The next prime is 1231172355691. The reversal of 1231172355655 is 5565532711321.

It is not a de Polignac number, because 1231172355655 - 2¹⁹ = 1231171831367 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 235980 + ... + 1586830.

It is an arithmetic number, because the mean of its divisors is an integer number (51281043624).

Almost surely, 2^{1231172355655} is an apocalyptic number.

1231172355655 is a deficient number, since it is larger than the sum of its proper divisors (409821040313).

1231172355655 is a wasteful number, since it uses less digits than its factorization.

1231172355655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1351167.

The product of its digits is 945000, while the sum is 46.

The spelling of 1231172355655 in words is "one trillion, two hundred thirty-one billion, one hundred seventy-two million, three hundred fifty-five thousand, six hundred fifty-five".