61487491228816 has 45 divisors (see below), whose sum is σ = 119745831605043. Its totient is φ = 30586149237600.

The previous prime is 61487491228729. The next prime is 61487491228817. The reversal of 61487491228816 is 61882219478416.

The square root of 61487491228816 is 7841396.

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

It is a super-2 number, since 2×61487491228816² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61487491228817) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 6241746291 + ... + 6241756141.

Almost surely, 2^{61487491228816} is an apocalyptic number.

61487491228816 is the 7841396-th square number.

It is an amenable number.

61487491228816 is a deficient number, since it is larger than the sum of its proper divisors (58258340376227).

61487491228816 is an frugal number, since it uses more digits than its factorization.

61487491228816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20108 (or 10052 counting only the distinct ones).

The product of its digits is 74317824, while the sum is 67.

The spelling of 61487491228816 in words is "sixty-one trillion, four hundred eighty-seven billion, four hundred ninety-one million, two hundred twenty-eight thousand, eight hundred sixteen".