1980556501 has 8 divisors (see below), whose sum is σ = 2469265344. Its totient is φ = 1543290720.

The previous prime is 1980556499. The next prime is 1980556517. The reversal of 1980556501 is 1056550891.

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 1980556501 - 2¹ = 1980556499 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1980556001) 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, 12860680 + ... + 12860833.

It is an arithmetic number, because the mean of its divisors is an integer number (308658168).

Almost surely, 2^1980556501 is an apocalyptic number.

1980556501 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1980556501 is a deficient number, since it is larger than the sum of its proper divisors (488708843).

1980556501 is a wasteful number, since it uses less digits than its factorization.

1980556501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25721531.

The product of its (nonzero) digits is 54000, while the sum is 40.

The square root of 1980556501 is about 44503.4436982128. The cubic root of 1980556501 is about 1255.8248681142.

The spelling of 1980556501 in words is "one billion, nine hundred eighty million, five hundred fifty-six thousand, five hundred one".