61211501280 has 96 divisors (see below), whose sum is σ = 214240269600. Its totient is φ = 16323065856.

The previous prime is 61211501279. The next prime is 61211501347. The reversal of 61211501280 is 8210511216.

61211501280 is a `hidden beast` number, since 61 + 21 + 1 + 501 + 2 + 80 = 666.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7080345 + ... + 7088984.

It is an arithmetic number, because the mean of its divisors is an integer number (2231669475).

Almost surely, 2^61211501280 is an apocalyptic number.

61211501280 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

61211501280 is an abundant number, since it is smaller than the sum of its proper divisors (153028768320).

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

61211501280 is a wasteful number, since it uses less digits than its factorization.

61211501280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14169353 (or 14169339 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 27.

The spelling of 61211501280 in words is "sixty-one billion, two hundred eleven million, five hundred one thousand, two hundred eighty".