61391542798140 has 384 divisors, whose sum is σ = 189895716541440. Its totient is φ = 14749829971968.

The previous prime is 61391542798127. The next prime is 61391542798207. The reversal of 61391542798140 is 4189724519316.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 2168761867 + ... + 2168790173.

It is an arithmetic number, because the mean of its divisors is an integer number (494520095160).

It is a 1-persistent number, because it is pandigital, but 2⋅61391542798140 = 122783085596280 is not.

Almost surely, 2^{61391542798140} is an apocalyptic number.

61391542798140 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61391542798140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94947858270720).

61391542798140 is an abundant number, since it is smaller than the sum of its proper divisors (128504173743300).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61391542798140 is a wasteful number, since it uses less digits than its factorization.

61391542798140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28989 (or 28987 counting only the distinct ones).

The product of its (nonzero) digits is 13063680, while the sum is 60.

The spelling of 61391542798140 in words is "sixty-one trillion, three hundred ninety-one billion, five hundred forty-two million, seven hundred ninety-eight thousand, one hundred forty".