61778512941 has 16 divisors (see below), whose sum is σ = 87772256064. Its totient is φ = 38516085504.

The previous prime is 61778512909. The next prime is 61778512973. The reversal of 61778512941 is 14921587716.

It is an interprime number because it is at equal distance from previous prime (61778512909) and next prime (61778512973).

It is not a de Polignac number, because 61778512941 - 2⁵ = 61778512909 is a prime.

It is a super-2 number, since 2×61778512941² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61778513941) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3849775 + ... + 3865788.

It is an arithmetic number, because the mean of its divisors is an integer number (5485766004).

Almost surely, 2^61778512941 is an apocalyptic number.

It is an amenable number.

61778512941 is a deficient number, since it is larger than the sum of its proper divisors (25993743123).

61778512941 is a wasteful number, since it uses less digits than its factorization.

61778512941 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7715740.

The product of its digits is 846720, while the sum is 51.

The spelling of 61778512941 in words is "sixty-one billion, seven hundred seventy-eight million, five hundred twelve thousand, nine hundred forty-one".