3551561081376 has 384 divisors, whose sum is σ = 12704028180480. Its totient is φ = 840211660800.

The previous prime is 3551561081371. The next prime is 3551561081381. The reversal of 3551561081376 is 6731801651553.

It is an interprime number because it is at equal distance from previous prime (3551561081371) and next prime (3551561081381).

It is a super-2 number, since 2×3551561081376² (a number of 26 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is not an unprimeable number, because it can be changed into a prime (3551561081371) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3439740 + ... + 4351428.

It is an arithmetic number, because the mean of its divisors is an integer number (33083406720).

Almost surely, 2^{3551561081376} 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 3551561081376, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6352014090240).

3551561081376 is an abundant number, since it is smaller than the sum of its proper divisors (9152467099104).

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

3551561081376 is a wasteful number, since it uses less digits than its factorization.

3551561081376 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 911768 (or 911760 counting only the distinct ones).

The product of its (nonzero) digits is 2268000, while the sum is 51.

The spelling of 3551561081376 in words is "three trillion, five hundred fifty-one billion, five hundred sixty-one million, eighty-one thousand, three hundred seventy-six".