1564861901461 has 4 divisors (see below), whose sum is σ = 1588218049312. Its totient is φ = 1541505753612.

The previous prime is 1564861901417. The next prime is 1564861901483. The reversal of 1564861901461 is 1641091684651.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1564861901461 - 2²¹ = 1564859804309 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1564861901399 and 1564861901408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1564861901261) 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 3 ways as a sum of consecutive naturals, for example, 11678073825 + ... + 11678073958.

It is an arithmetic number, because the mean of its divisors is an integer number (397054512328).

Almost surely, 2^{1564861901461} is an apocalyptic number.

It is an amenable number.

1564861901461 is a deficient number, since it is larger than the sum of its proper divisors (23356147851).

1564861901461 is an equidigital number, since it uses as much as digits as its factorization.

1564861901461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23356147850.

The product of its (nonzero) digits is 1244160, while the sum is 52.

The spelling of 1564861901461 in words is "one trillion, five hundred sixty-four billion, eight hundred sixty-one million, nine hundred one thousand, four hundred sixty-one".