61259999661 has 48 divisors (see below), whose sum is σ = 102895228800. Its totient is φ = 34394471424.

The previous prime is 61259999641. The next prime is 61259999663. The reversal of 61259999661 is 16699995216.

61259999661 is a `hidden beast` number, since 612 + 5 + 9 + 9 + 9 + 9 + 6 + 6 + 1 = 666.

61259999661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 61259999661 - 2¹⁵ = 61259966893 is a prime.

It is a super-2 number, since 2×61259999661² (a number of 22 digits) contains 22 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61259999663) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 10765305 + ... + 10770993.

It is an arithmetic number, because the mean of its divisors is an integer number (2143650600).

Almost surely, 2^61259999661 is an apocalyptic number.

It is an amenable number.

61259999661 is a deficient number, since it is larger than the sum of its proper divisors (41635229139).

61259999661 is a wasteful number, since it uses less digits than its factorization.

61259999661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8658 (or 8655 counting only the distinct ones).

The product of its digits is 14171760, while the sum is 63.

The spelling of 61259999661 in words is "sixty-one billion, two hundred fifty-nine million, nine hundred ninety-nine thousand, six hundred sixty-one".