61620162990 has 64 divisors (see below), whose sum is σ = 156742698240. Its totient is φ = 15450145280.

The previous prime is 61620162979. The next prime is 61620163013. The reversal of 61620162990 is 9926102616.

It is a happy number.

61620162990 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 460405 + ... + 578975.

It is an arithmetic number, because the mean of its divisors is an integer number (2449104660).

Almost surely, 2^61620162990 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61620162990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78371349120).

61620162990 is an abundant number, since it is smaller than the sum of its proper divisors (95122535250).

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

61620162990 is a wasteful number, since it uses less digits than its factorization.

61620162990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119617.

The product of its (nonzero) digits is 69984, while the sum is 42.

The spelling of 61620162990 in words is "sixty-one billion, six hundred twenty million, one hundred sixty-two thousand, nine hundred ninety".