1561625471541 has 16 divisors (see below), whose sum is σ = 2149466411520. Its totient is φ = 1007438228160.

The previous prime is 1561625471507. The next prime is 1561625471579. The reversal of 1561625471541 is 1451745261651.

It is a happy number.

It is not a de Polignac number, because 1561625471541 - 2³⁵ = 1527265733173 is a prime.

It is a super-2 number, since 2×1561625471541² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1561625471941) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 1024795 + ... + 2042903.

It is an arithmetic number, because the mean of its divisors is an integer number (134341650720).

Almost surely, 2^{1561625471541} is an apocalyptic number.

It is an amenable number.

1561625471541 is a deficient number, since it is larger than the sum of its proper divisors (587840939979).

1561625471541 is a wasteful number, since it uses less digits than its factorization.

1561625471541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1034636.

The product of its digits is 1008000, while the sum is 48.

The spelling of 1561625471541 in words is "one trillion, five hundred sixty-one billion, six hundred twenty-five million, four hundred seventy-one thousand, five hundred forty-one".