61644169051487 has 16 divisors (see below), whose sum is σ = 67331367417600. Its totient is φ = 55970843691840.

The previous prime is 61644169051319. The next prime is 61644169051499. The reversal of 61644169051487 is 78415096144616.

It is not a de Polignac number, because 61644169051487 - 2¹⁴ = 61644169035103 is a prime.

It is a super-2 number, since 2×61644169051487² (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 (61644169051987) 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, 138911564 + ... + 139354622.

It is an arithmetic number, because the mean of its divisors is an integer number (4208210463600).

Almost surely, 2^{61644169051487} is an apocalyptic number.

61644169051487 is a deficient number, since it is larger than the sum of its proper divisors (5687198366113).

61644169051487 is a wasteful number, since it uses less digits than its factorization.

61644169051487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 458686.

The product of its (nonzero) digits is 34836480, while the sum is 62.

The spelling of 61644169051487 in words is "sixty-one trillion, six hundred forty-four billion, one hundred sixty-nine million, fifty-one thousand, four hundred eighty-seven".