61497556990 has 16 divisors (see below), whose sum is σ = 110703814848. Its totient is φ = 24597197856.

The previous prime is 61497556987. The next prime is 61497556993. The reversal of 61497556990 is 9965579416.

It is an interprime number because it is at equal distance from previous prime (61497556987) and next prime (61497556993).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61497556993) 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, 82137 + ... + 360196.

It is an arithmetic number, because the mean of its divisors is an integer number (6918988428).

Almost surely, 2^61497556990 is an apocalyptic number.

61497556990 is a deficient number, since it is larger than the sum of its proper divisors (49206257858).

61497556990 is a wasteful number, since it uses less digits than its factorization.

61497556990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 456243.

The product of its (nonzero) digits is 18370800, while the sum is 61.

The spelling of 61497556990 in words is "sixty-one billion, four hundred ninety-seven million, five hundred fifty-six thousand, nine hundred ninety".