61121057344440 has 32 divisors (see below), whose sum is σ = 183363172033680. Its totient is φ = 16298948625152.

The previous prime is 61121057344429. The next prime is 61121057344469. The reversal of 61121057344440 is 4444375012116.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 61121057344392 and 61121057344401.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 254671072149 + ... + 254671072388.

Almost surely, 2^{61121057344440} is an apocalyptic number.

61121057344440 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

61121057344440 is an abundant number, since it is smaller than the sum of its proper divisors (122242114689240).

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

61121057344440 is a wasteful number, since it uses less digits than its factorization.

61121057344440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 509342144551 (or 509342144547 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 42.

The spelling of 61121057344440 in words is "sixty-one trillion, one hundred twenty-one billion, fifty-seven million, three hundred forty-four thousand, four hundred forty".