191025828465 has 16 divisors (see below), whose sum is σ = 305733382848. Its totient is φ = 101849756096.

The previous prime is 191025828431. The next prime is 191025828467. The reversal of 191025828465 is 564828520191.

It is a cyclic number.

It is not a de Polignac number, because 191025828465 - 2²³ = 191017439857 is a prime.

It is a super-3 number, since 3×191025828465³ (a number of 35 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (191025828467) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1866354 + ... + 1966043.

It is an arithmetic number, because the mean of its divisors is an integer number (19108336428).

Almost surely, 2^191025828465 is an apocalyptic number.

191025828465 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

191025828465 is a deficient number, since it is larger than the sum of its proper divisors (114707554383).

191025828465 is a wasteful number, since it uses less digits than its factorization.

191025828465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3835728.

The product of its (nonzero) digits is 1382400, while the sum is 51.

The spelling of 191025828465 in words is "one hundred ninety-one billion, twenty-five million, eight hundred twenty-eight thousand, four hundred sixty-five".