1561648487694 has 16 divisors (see below), whose sum is σ = 3123463572432. Its totient is φ = 520521729728.

The previous prime is 1561648487689. The next prime is 1561648487731. The reversal of 1561648487694 is 4967848461651.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6819519 + ... + 7044794.

It is an arithmetic number, because the mean of its divisors is an integer number (195216473277).

Almost surely, 2^{1561648487694} is an apocalyptic number.

1561648487694 is an abundant number, since it is smaller than the sum of its proper divisors (1561815084738).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1561648487694 is a wasteful number, since it uses less digits than its factorization.

1561648487694 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13883091.

The product of its digits is 278691840, while the sum is 69.

The spelling of 1561648487694 in words is "one trillion, five hundred sixty-one billion, six hundred forty-eight million, four hundred eighty-seven thousand, six hundred ninety-four".