1561647389653 has 32 divisors (see below), whose sum is σ = 1716741734400. Its totient is φ = 1411865816256.

The previous prime is 1561647389641. The next prime is 1561647389677. The reversal of 1561647389653 is 3569837461651.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1561647389653 is a prime.

It is a super-2 number, since 2×1561647389653² (a number of 25 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 (1561647380653) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 221852908 + ... + 221859946.

It is an arithmetic number, because the mean of its divisors is an integer number (53648179200).

Almost surely, 2^{1561647389653} is an apocalyptic number.

1561647389653 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1561647389653 is a deficient number, since it is larger than the sum of its proper divisors (155094344747).

1561647389653 is a wasteful number, since it uses less digits than its factorization.

1561647389653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8881.

The product of its digits is 97977600, while the sum is 64.

It can be divided in two parts, 1561647 and 389653, that added together give a triangular number (1951300 = T₁₉₇₅).

The spelling of 1561647389653 in words is "one trillion, five hundred sixty-one billion, six hundred forty-seven million, three hundred eighty-nine thousand, six hundred fifty-three".