261952906698 has 24 divisors (see below), whose sum is σ = 648645293088. Its totient is φ = 74843687592.

The previous prime is 261952906573. The next prime is 261952906723. The reversal of 261952906698 is 896609259162.

261952906698 is a `hidden beast` number, since 2 + 6 + 19 + 529 + 0 + 6 + 6 + 98 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1039495536 + ... + 1039495787.

It is an arithmetic number, because the mean of its divisors is an integer number (27026887212).

Almost surely, 2^261952906698 is an apocalyptic number.

261952906698 is an abundant number, since it is smaller than the sum of its proper divisors (386692386390).

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

261952906698 is a wasteful number, since it uses less digits than its factorization.

261952906698 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2078991338 (or 2078991335 counting only the distinct ones).

The product of its (nonzero) digits is 25194240, while the sum is 63.

The spelling of 261952906698 in words is "two hundred sixty-one billion, nine hundred fifty-two million, nine hundred six thousand, six hundred ninety-eight".