61869067509 has 32 divisors (see below), whose sum is σ = 90431280000. Its totient is φ = 37474424064.

The previous prime is 61869067493. The next prime is 61869067537. The reversal of 61869067509 is 90576096816.

It is a happy number.

It is not a de Polignac number, because 61869067509 - 2⁴ = 61869067493 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61869067009) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 120699 + ... + 371895.

It is an arithmetic number, because the mean of its divisors is an integer number (2825977500).

Almost surely, 2^61869067509 is an apocalyptic number.

It is an amenable number.

61869067509 is a deficient number, since it is larger than the sum of its proper divisors (28562212491).

61869067509 is a wasteful number, since it uses less digits than its factorization.

61869067509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 251397.

The product of its (nonzero) digits is 4898880, while the sum is 57.

The spelling of 61869067509 in words is "sixty-one billion, eight hundred sixty-nine million, sixty-seven thousand, five hundred nine".