61705153251 has 12 divisors (see below), whose sum is σ = 101862475312. Its totient is φ = 35260087536.

The previous prime is 61705153199. The next prime is 61705153261. The reversal of 61705153251 is 15235150716.

It is a happy number.

61705153251 is a `hidden beast` number, since 6 + 1 + 70 + 5 + 1 + 532 + 51 = 666.

It is not a de Polignac number, because 61705153251 - 2¹⁸ = 61704891107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61705153261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 489723376 + ... + 489723501.

Almost surely, 2^61705153251 is an apocalyptic number.

61705153251 is a deficient number, since it is larger than the sum of its proper divisors (40157322061).

61705153251 is a wasteful number, since it uses less digits than its factorization.

61705153251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 979446890 (or 979446887 counting only the distinct ones).

The product of its (nonzero) digits is 31500, while the sum is 36.

The spelling of 61705153251 in words is "sixty-one billion, seven hundred five million, one hundred fifty-three thousand, two hundred fifty-one".