261870567516 has 48 divisors (see below), whose sum is σ = 679857767680. Its totient is φ = 87170094000.

The previous prime is 261870567509. The next prime is 261870567547. The reversal of 261870567516 is 615765078162.

It is a happy number.

261870567516 is a `hidden beast` number, since 2 + 6 + 1 + 8 + 70 + 56 + 7 + 516 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1589110 + ... + 1746141.

Almost surely, 2^261870567516 is an apocalyptic number.

It is an amenable number.

261870567516 is an abundant number, since it is smaller than the sum of its proper divisors (417987200164).

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

261870567516 is a wasteful number, since it uses less digits than its factorization.

261870567516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3335991 (or 3335983 counting only the distinct ones).

The product of its (nonzero) digits is 4233600, while the sum is 54.

The spelling of 261870567516 in words is "two hundred sixty-one billion, eight hundred seventy million, five hundred sixty-seven thousand, five hundred sixteen".