61159763025 has 27 divisors (see below), whose sum is σ = 109550575771. Its totient is φ = 32616561840.

The previous prime is 61159763003. The next prime is 61159763083. The reversal of 61159763025 is 52036795116.

The square root of 61159763025 is 247305.

It is a perfect power (a square), and thus also a powerful number.

61159763025 is a `hidden beast` number, since 6 + 1 + 1 + 5 + 9 + 7 + 630 + 2 + 5 = 666.

It can be written as a sum of positive squares in only one way, i.e., 22017514689 + 39142248336 = 148383^2 + 197844^2 .

It is a de Polignac number, because none of the positive numbers 2^k-61159763025 is a prime.

It is a super-2 number, since 2×61159763025² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 3701332 + ... + 3717818.

Almost surely, 2^61159763025 is an apocalyptic number.

61159763025 is the 247305-th square number.

61159763025 is the 123653-rd centered octagonal number.

It is an amenable number.

61159763025 is a deficient number, since it is larger than the sum of its proper divisors (48390812746).

61159763025 is an frugal number, since it uses more digits than its factorization.

61159763025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32990 (or 16495 counting only the distinct ones).

The product of its (nonzero) digits is 340200, while the sum is 45.

The spelling of 61159763025 in words is "sixty-one billion, one hundred fifty-nine million, seven hundred sixty-three thousand, twenty-five".