61090213905 has 32 divisors (see below), whose sum is σ = 124119801600. Its totient is φ = 27926954496.

The previous prime is 61090213867. The next prime is 61090213909. The reversal of 61090213905 is 50931209016.

61090213905 is a `hidden beast` number, since 610 + 9 + 0 + 2 + 1 + 39 + 0 + 5 = 666.

It is not a de Polignac number, because 61090213905 - 2⁶ = 61090213841 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61090213905.

It is not an unprimeable number, because it can be changed into a prime (61090213909) 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, 32321920 + ... + 32323809.

It is an arithmetic number, because the mean of its divisors is an integer number (3878743800).

Almost surely, 2^61090213905 is an apocalyptic number.

It is an amenable number.

61090213905 is an abundant number, since it is smaller than the sum of its proper divisors (63029587695).

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

61090213905 is a wasteful number, since it uses less digits than its factorization.

61090213905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64645750 (or 64645744 counting only the distinct ones).

The product of its (nonzero) digits is 14580, while the sum is 36.

The spelling of 61090213905 in words is "sixty-one billion, ninety million, two hundred thirteen thousand, nine hundred five".