1351261561564 has 24 divisors (see below), whose sum is σ = 2489222085840. Its totient is φ = 640056852864.

The previous prime is 1351261561541. The next prime is 1351261561567. The reversal of 1351261561564 is 4651651621531.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1351261561567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3691602 + ... + 4041094.

It is an arithmetic number, because the mean of its divisors is an integer number (103717586910).

Almost surely, 2^{1351261561564} is an apocalyptic number.

It is an amenable number.

1351261561564 is a deficient number, since it is larger than the sum of its proper divisors (1137960524276).

1351261561564 is a wasteful number, since it uses less digits than its factorization.

1351261561564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 400389 (or 400387 counting only the distinct ones).

The product of its digits is 648000, while the sum is 46.

The spelling of 1351261561564 in words is "one trillion, three hundred fifty-one billion, two hundred sixty-one million, five hundred sixty-one thousand, five hundred sixty-four".