61826520987 has 24 divisors (see below), whose sum is σ = 111341268480. Its totient is φ = 32117672880.

The previous prime is 61826520983. The next prime is 61826520989. The reversal of 61826520987 is 78902562816.

61826520987 is a `hidden beast` number, since 6 + 1 + 8 + 26 + 520 + 98 + 7 = 666.

It is not a de Polignac number, because 61826520987 - 2² = 61826520983 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61826520983) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 44607187 + ... + 44608572.

It is an arithmetic number, because the mean of its divisors is an integer number (4639219520).

Almost surely, 2^61826520987 is an apocalyptic number.

61826520987 is a deficient number, since it is larger than the sum of its proper divisors (49514747493).

61826520987 is a wasteful number, since it uses less digits than its factorization.

61826520987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89215783 (or 89215780 counting only the distinct ones).

The product of its (nonzero) digits is 2903040, while the sum is 54.

The spelling of 61826520987 in words is "sixty-one billion, eight hundred twenty-six million, five hundred twenty thousand, nine hundred eighty-seven".