61521790544551 has 8 divisors (see below), whose sum is σ = 65353905940400. Its totient is φ = 57749087790720.

The previous prime is 61521790544483. The next prime is 61521790544653. The reversal of 61521790544551 is 15544509712516.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61521790544551 - 2¹⁹ = 61521790020263 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61521790544492 and 61521790544501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61521790544351) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14853158370 + ... + 14853162511.

It is an arithmetic number, because the mean of its divisors is an integer number (8169238242550).

Almost surely, 2^{61521790544551} is an apocalyptic number.

61521790544551 is a deficient number, since it is larger than the sum of its proper divisors (3832115395849).

61521790544551 is a wasteful number, since it uses less digits than its factorization.

61521790544551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29706321009.

The product of its (nonzero) digits is 7560000, while the sum is 55.

The spelling of 61521790544551 in words is "sixty-one trillion, five hundred twenty-one billion, seven hundred ninety million, five hundred forty-four thousand, five hundred fifty-one".