1561625320343 has 12 divisors (see below), whose sum is σ = 1762889075640. Its totient is φ = 1381290205680.

The previous prime is 1561625320319. The next prime is 1561625320363. The reversal of 1561625320343 is 3430235261651.

It is not a de Polignac number, because 1561625320343 - 2¹⁸ = 1561625058199 is a prime.

It is a super-2 number, since 2×1561625320343² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1561625320343.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1561625320313) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 174400853 + ... + 174409806.

It is an arithmetic number, because the mean of its divisors is an integer number (146907422970).

Almost surely, 2^{1561625320343} is an apocalyptic number.

1561625320343 is a deficient number, since it is larger than the sum of its proper divisors (201263755297).

1561625320343 is a wasteful number, since it uses less digits than its factorization.

1561625320343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 348810718 (or 348810707 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 41.

The spelling of 1561625320343 in words is "one trillion, five hundred sixty-one billion, six hundred twenty-five million, three hundred twenty thousand, three hundred forty-three".