1561771233400 has 96 divisors (see below), whose sum is σ = 4169517598080. Its totient is φ = 532926576000.

The previous prime is 1561771233307. The next prime is 1561771233433. The reversal of 1561771233400 is 43321771651.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2348086 + ... + 2938885.

It is an arithmetic number, because the mean of its divisors is an integer number (43432474980).

Almost surely, 2^{1561771233400} is an apocalyptic number.

1561771233400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1561771233400 is an abundant number, since it is smaller than the sum of its proper divisors (2607746364680).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1561771233400 is a wasteful number, since it uses less digits than its factorization.

1561771233400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5287205 (or 5287196 counting only the distinct ones).

The product of its (nonzero) digits is 105840, while the sum is 40.

The spelling of 1561771233400 in words is "one trillion, five hundred sixty-one billion, seven hundred seventy-one million, two hundred thirty-three thousand, four hundred".