55213691520 has 256 divisors, whose sum is σ = 192749155200. Its totient is φ = 13360349184.

The previous prime is 55213691501. The next prime is 55213691539. The reversal of 55213691520 is 2519631255.

It is an interprime number because it is at equal distance from previous prime (55213691501) and next prime (55213691539).

It is a Harshad number since it is a multiple of its sum of digits (39).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1453894 + ... + 1491386.

Almost surely, 2^55213691520 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55213691520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (96374577600).

55213691520 is an abundant number, since it is smaller than the sum of its proper divisors (137535463680).

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

55213691520 is a wasteful number, since it uses less digits than its factorization.

55213691520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37587 (or 37575 counting only the distinct ones).

The product of its (nonzero) digits is 81000, while the sum is 39.

The spelling of 55213691520 in words is "fifty-five billion, two hundred thirteen million, six hundred ninety-one thousand, five hundred twenty".