61001485823781 has 6 divisors (see below), whose sum is σ = 88113257301030. Its totient is φ = 40667657215848.

The previous prime is 61001485823753. The next prime is 61001485823809. The reversal of 61001485823781 is 18732858410016.

61001485823781 is a `hidden beast` number, since 6 + 1 + 0 + 0 + 1 + 485 + 82 + 3 + 7 + 81 = 666.

It is an interprime number because it is at equal distance from previous prime (61001485823753) and next prime (61001485823809).

It can be written as a sum of positive squares in only one way, i.e., 56743829122500 + 4257656701281 = 7532850^2 + 2063409^2 .

It is not a de Polignac number, because 61001485823781 - 2⁵ = 61001485823749 is a prime.

It is a super-2 number, since 2×61001485823781² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61001485823701) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3388971434646 + ... + 3388971434663.

It is an arithmetic number, because the mean of its divisors is an integer number (14685542883505).

Almost surely, 2^{61001485823781} is an apocalyptic number.

It is an amenable number.

61001485823781 is a deficient number, since it is larger than the sum of its proper divisors (27111771477249).

61001485823781 is a wasteful number, since it uses less digits than its factorization.

61001485823781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6777942869315 (or 6777942869312 counting only the distinct ones).

The product of its (nonzero) digits is 2580480, while the sum is 54.

The spelling of 61001485823781 in words is "sixty-one trillion, one billion, four hundred eighty-five million, eight hundred twenty-three thousand, seven hundred eighty-one".