1561755206167 has 4 divisors (see below), whose sum is σ = 1681890222040. Its totient is φ = 1441620190296.

The previous prime is 1561755206119. The next prime is 1561755206173. The reversal of 1561755206167 is 7616025571651.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1561755206167 - 2³⁵ = 1527395467799 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1561755206267) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60067507917 + ... + 60067507942.

It is an arithmetic number, because the mean of its divisors is an integer number (420472555510).

Almost surely, 2^{1561755206167} is an apocalyptic number.

1561755206167 is a deficient number, since it is larger than the sum of its proper divisors (120135015873).

1561755206167 is a wasteful number, since it uses less digits than its factorization.

1561755206167 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120135015872.

The product of its (nonzero) digits is 2646000, while the sum is 52.

The spelling of 1561755206167 in words is "one trillion, five hundred sixty-one billion, seven hundred fifty-five million, two hundred six thousand, one hundred sixty-seven".